IRCTC PNR status and confirmation prediction

PNR (Passenger Name Record) is a 10-digit number allotted to each indian railway ticket. A passenger can check train PNR status and do railway enquiry on Trainman for tickets booked on IRCTC. Along with PNR status, Trainman also does PNR prediction for waiting list train tickets. This reservation status freezes on chart preparation which happens nearly 4 hours before train departure. This means that PNR status does not change after chart preparation. Passengers having confirmed or RAC PNR are allotted berths. Tickets booked on IRCTC which have wait-listed status are cancelled automatically. For few lucky passengers, the travel class is upgraded for same PNR if accommodation is available in a higher class. For example a passenger having reserved berth in sleeper class can get upgraded to third ac without any extra fare.